A new digital zero average current error control algorithm for inverters

Inverter performance is typically measured against its ability to produce a high fidelity output sinusoidal waveform with narrow band switching freque ncy and good transient response. For this purpose, pulse-width modulation t echniques are used to generate the required control signals for the inverte r semiconductor switches. Current control voltage-source inverters can be r ealized using one of the recently proposed zero average current error (ZACE ) techniques based on analogue technology. A new and improved algorithm tha t belongs to the family of ZACE methods suitable for digital technology is proposed in this paper. Advantages include a more robust algorithm with qui cker computation allowing fast response and higher switching frequency from a digital signal processor. The effectiveness of the new current control a lgorithm is demonstrated through simulations first. Experimental results ta ken from a low power laboratory prototype are also presented to verify the theoretical considerations.